While you're questions are welcome here, they will likely not receive a lot of upvotes--and therefore a lot of attention--since they only really relate to the person asking. You may want to try posting your question in /r/AndroidQuestions, where people will be more likely to be able to help you.

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I used to use DeskSMS. It's originally for android users to send text from gtalk or their web interface. But they also developed an cydia plugin for iOS. So I did manage to send and receive imessages on my android tablet from gtalk. But it does not support mms at that time.
It requires you to jailbreak your iPhone, and the service also not free. It's $5/year.
I'm also contently look up for these kind of service and this one still seems to be the only method.